Coil mounting



Nov. 17, I925- 1,561,834

' E. 1'. CUNNINGHAM corn uouu'rma and Feb. 2?. i922 WIT/V553. I INVEN TOR.

f/mer Item/ 7 ham. BY Gd 1 A TTORNEYS.

Patented Nov. 17, 1925.

ELM-ER CUNNINGHAM, or salt rnancrsco, carrronnra.

corn MOUNTING.

Application filed February 27, 1,922.

'in,connection with radio signaling sets.

Such coils are usually required to be readily movable so that the inductive coupling between them may be controlled. It is one of the objects of my invention to provide a simple and inexpensive coil mounting that incorporates a support for the coil as well as for the terminals and may be readily attached to a pivoted or otherwise movable cooperating terminal block.

Another object of my invention is to provide a mounting for the coil and its terminals involving the use of a fastening band interlinking the coil and fastening against a small portion of the inside peripheral surface of the coil.

My invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description where I shall outline in full those embodiments of my invention which I have selected for illustration in the drawings accompanying and forming part of the present specification. In the drawings, I have shown several different forms of my invention, but it is to be understood that I do not limit myself to those forms, since the invention as expressed in the claims may be embodied in other forms as well.

Referring to the drawings;

Figure 1 is a sectional view of a coil and its mounting constructed in accordance with my invention;

Fig. 2 is a partial plan view from the top of Fig. 1;

Fig. 3 is a detail of one of the elements of the fastening means;

Fig. 4 is a partial sectional view of a modification; and

Fig. 5 is a partial front view of a further modification.

A coil 11 of an ordinary circular form is associated with a terminal block 12 of insulating material. As is customary, this Serial No. 5391534.

block; is provided with a plug 13 and a socket 1 1 to which the ends of the, coil 11 are con nected. The block; 12 is adapted to. be firmlyclamped to. the outer peripheral surface 5 ofthe coil 11 and in order to provide for a good clamping engagement, apair of feet 15 are provided, bearing against two por tions of the coil surface separated by sub.-.

1 stantial distance. The coil 11 and the block 19 fo m a c m-pac it. a d. when t e. p ug 13 and socket 14 are in place in the cooperating terminal block, the coil 11 is provided with a sufficiently rigid support.

The clamp for holding the block to the coil includes a thin metallic band 16 which links the coil 11, as clearly shown in Fig. 1, and engages with the top and bottom surfaces of the block 12. This block is made as wide as the coil 11, but there is a gradual decrease in width as the outer edge 17 is approached, and for this reason the surfaces referred to hereinbefore are curved to connect the wide with the narrow portion. A bolt 18 or other fastening means passes through the band 16 and the block, and serves to secure them together. A clamping strip 19 engages the inside peripheral surface of the coil, and is urged against that surface by a thumb screw 20. This thumb screw is threaded intoa plate 21. Both the plate 21 and the strip 19 are provided with projections 22 at each end engaging in slots 23 formed in the sides of the band 16, for properly guiding them. There is an aperture in the portion 2 1 of the band 16 permitting the thumbscrew 20 to pass therethrough. It is evident that by turning the thumbscrew, the members 21 and 19 are urged in opposite directions, one against the inner surface of member 2 1, and the other against the inner peripheral surface of the coil 11. The block 12 is thus pulled, by the ba id 16, against the outer surface of the col In order to provide a slight adjustment, slots 25 may be formed near the extremities of the band 16 for the accommodation of the bolt 18.

The pulling force exerted on the strap may be applied in other forms of tightening devices. Thus in Fig. 4 the band 26 fastened to the block 12 carries a tapped member 27, and into this member a thumb screw 28 is tapped, with its head engaging the inner surface of coil 11. By turnlng this thumbscrew in the proper direction the block 12 is pressed. into close engagement with the outer surface of the coil.

Still another form of clamp is illustrated in Fig. 5. In this instance there is pivoted in the band 29 a cam 30 having a serrated edge 31 for engaging the inner surface of the coil. By pressing the cam downwardly, the block 12 is tightened against the coil l1, and the cam may be retained in this position by properly fastening the cam in place, as by the screw 32.

Many other modifications of my invention are possible. all utilizing the principle of an interlinked band, urged by a tighten ing means engaging the inner surface of the coil in the proper direction to clamp the terminal block.

I claim:

A coil having an inner and an outer peripheral surface, a block engaging the outer peripheral surface and having terminals to which the ends of the coil are connected, a band fastened to the block at both ends of the band and passing around the inner surface of the coil, said band having slots adjacent the inner surface of the coil, a flat clamping piece engaging the inner surface of the coil and having projections at each end guided in the slots in the band, a threaded member also having projections at each end guided in the slots, and a thumbscrew engaging the threaded member and passing through the band for tightening the flat clamping piece against. the inner coil i surface.

In testimony whereof, I have hereunto set 

